markw444 Posted July 9, 2018 Report Share Posted July 9, 2018 Hello, I've successfully connected a small network of Samba HMI/PLCs, and have had my computer running a program to pull data through MODBUS TCP (computer is master, all Samba units are slaves). I can successfully pull data from any of the 256 MIs as their indexing starts at 0 in regards to function code 3: read holding registers. However, I need to pull data from one of the memory long values. I could copy the data into two MIs (as suggested on another forum post), but I would prefer not to in order to limit register use for future changes to my ladder logic. The help files list the starting pointer value for MLs as 5100 in Standard Vision products, but I could not successfully pull data using this as a starting address in my MODBUS commands. I have tried finding documentation regarding this question, but I may be searching in the wrong place. If anyone knows the starting index for memory long values in Samba units, I would greatly appreciate that information. Thanks, Mark Quote Link to comment Share on other sites More sharing options...
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